Backpack cooler



FIG. 1 is a top, front, right perspective view of a backpack cooler showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a top, back, left perspective view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the backpack cooler represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a backpack cooler, as shown and described. 